/*
 * Licensed to Metamarkets Group Inc. (Metamarkets) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. Metamarkets licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package io.druid.segment.data;


import com.google.common.primitives.Doubles;
import io.druid.java.util.common.guava.Comparators;

import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.DoubleBuffer;

public class CompressedDoubleBufferObjectStrategy extends FixedSizeCompressedObjectStrategy<DoubleBuffer>
{
  public static CompressedDoubleBufferObjectStrategy getBufferForOrder(
      final ByteOrder order,
      final CompressionStrategy compression,
      final int size
  )
  {
    return new CompressedDoubleBufferObjectStrategy(order, compression, size);
  }
  private CompressedDoubleBufferObjectStrategy(
      ByteOrder order,
      CompressionStrategy compression,
      int sizePer
  )
  {
    super(order, new BufferConverter<DoubleBuffer>()
    {
      @Override
      public DoubleBuffer convert(ByteBuffer buf)
      {
        return buf.asDoubleBuffer();
      }

      @Override
      public int compare(DoubleBuffer lhs, DoubleBuffer rhs)
      {
        return Comparators.<DoubleBuffer>naturalNullsFirst().compare(lhs, rhs);
      }

      @Override
      public int sizeOf(int count)
      {
        return count * Doubles.BYTES;
      }

      @Override
      public DoubleBuffer combine(ByteBuffer into, DoubleBuffer from)
      {
        return into.asDoubleBuffer().put(from);
      }
    }, compression, sizePer);
  }
}
